Single pole multi throw switch

Abstract

A single pole multi throw switch comprises a first switching unit, a second switching unit coupled to a common port and comprising a parasitic off state capacitance, and a matching unit. The matching unit may be coupled between the first switching unit and the common port, wherein the matching unit is configured to contribute, in conjunction with the parasitic off state capacitance of the second switching unit, to an impedance match if the first switching unit is active and the second switching unit is inactive.

Description

Background technique [0001] In a single-pole N-throw radio-frequency (RF) switch, the insertion loss is through the on-resistance of the active components of the switch (e.g., CMOS transistors, complementary metal-oxide-semiconductor transistors) and the 1 / (N-1) resistance shunting to the open port (N-1) times the parasitic capacitance of disconnected ports in series for improved port-to-port isolation. The resistance can be reduced by increasing the size (eg, length or width) of the shunt and the capacitance matched by an external LC matching network. For antenna switching applications, for example, a shunt inductor is added for ESD protection and parasitic capacitance compensation on the low side bands, while a series inductor-shunt capacitor network is used for matching in the high band. [0002] A disadvantage of certain known switches is high insertion losses. A disadvantage of some other known switches is the large number of discrete components or external components. ...

AI Technical Summary

Problems solved by technology

[0002] A disadvantage of some known switches is high insertion loss

A disadvantage of some other known switches is the large number of discrete components or external components

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